#include <iostream>
#include <cstring>
using namespace std;

int countVowels(const char* p) {
    int cnt = 0;
    while (*p) {
        if (*p == 'a' || *p == 'e' || *p == 'i' || *p == 'o' || *p == 'u' ||
            *p == 'A' || *p == 'E' || *p == 'I' || *p == 'O' || *p == 'U') cnt++;
        p++;
    }
    return cnt;
}

int main() {
    char s[100];
    cin.getline(s, 100);
    cout << "Number of vowels: " << countVowels(s) << endl;
    return 0;
}
